functions.php

<?php

// Add the following snippet to your functions.php file.
function my_google_adsense() {
	wp_enqueue_script( 'my-google-adsense-js', '//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js', array(), false, false );
}

add_action( 'wp_enqueue_scripts', 'my_google_adsense' );